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Both of these sections describe the "locator" produced by ctags
as a Basic Regular Expression (BRE).
Historically however, ctags has not produced BREs but strings
suitable for searching in ex/vi when the ex
option "set nomagic" is in effect.
Was it the intention of the P1003.2 working group to differ from
historical practice in the very significant
way?

Interpretation Response
The standard states that ctags produces a string, not a BRE as the
locator, and conforming
implementations must conform to this. However, concerns have
been raised about this which are being
referred to the sponsor.